Apparatus for cutting and polishing precious stones.



F. E. HILLIARD & W. G. STEVENS.

APPARATUS FOR CUTTING AND POLISHING PRECIOUS STONES.

APPLICATION HLED MAY-19,1916.

1 ,228,9 19. PatentedJune 5, 1917.

FREDERICK E. HIELIARD, 0F BROOKLYN, NEW

or PALIsADEs PARK,

YQRK, AND, ALTER GOUGH STEVENS, NEW JERSEY.

APPARATUS, FOR CUTTING AND POLISHING PEEcIous STONES.

Specification of Letters Patent.

Application filed May 19, 1916. Serial No. 98,508.

To all whom it may concern. Be it known that we, FREDERICK E. HIL- LIARDand WALTER G. STEvnNs, of the city of New York, borough of Brooklyn, NewYork, and Palisades Park, New Jersey, respectively, are the jointinventors of an Improvement in Apparatus for Cutting and PolishingPrecious Stones, of which the following description, in connection withthe accompanying drawings, is a specification, like letters and figureson the drawings representing like parts.

In the art of cutting stones, certain. apparatus has been heretoforeinvented to permit the lapidary to present the stone to the lapidaryswheel at the proper angle to grind the facets uniformly and in propernumber an d arrangement.

One of these devices which has come into considerable use is shown inPatent #510,817 of December 12th, 1893, and our present invention isdesigned to be used with the parts A, B, C, b and C shown in saidpatent. i

The object of the present invention is to provide a device whereby thelon g-stick may be used exclusively, the short-stick being entirelydispensed with, whereby considerable time is saved in cutting a givennumber of stones and greater accuracy is attained. A further object isto provide a more simple and convenient means for spacing the step bystep rotation of the stick into any number of even parts to accuratelyspace the facets.

Referring to the drawings forming a part of this specification,

Figure l. is a side elevational view of an apparatus embodying ourinvention.

Fig. 2. is an enlarged plan view, partly in section, of the hingeportion of the device and engaging portions of the; spacing means.

Fig. 3. is a plan view of the hinge portion showing the means used toadjust the stitfness of the hinge.

Fig. 4:. is an enlarged end view of one of the spacing elements.

Fig. 5 is an enlarged end View of one of the spacing elements used inconjunction with the element shown in Fig. 4.

Figs. 6 and 7 illustrate alternate or modified forms used instead ofthose shown in Figs. 4 and 5.

Fig. 8. illustrates a short and long stickholder respectively and aboutof full size as used commercially.

A indicates the top surface of a bench or table having 'a socket-piece Aattached thereto in which is rotatably held the rod B.

The lapidarys wheel P is carried by a suitable rotating shaft P. Thepost B receives upon it the hub C of a head, the other part of the headbeing a bracket C. By means of a screw C the hub C may be raised orlowered a pre-determined distance with relation to the wheel P. Thescrew C holds the head C in adjusted relation on the post B.

7) indicates a portion of the bracket C and is calibrated with anydesired number of sub-divisions as indicated by the lines C The partssofar referred to are commonly in use bylapidaries. Adjustably mounted onthe portion 6 and clamped thereto by the lever and screw elements 6 andb is a hinge comprising the parts D-D and D The rod portion D isprovided with a screw thread (Z at one end which engages a thread formedin the element B as illustrated and a shoulder d is formed at the innerend of the thread (Z, that abuts one side of the element D so that byturning the rod D the element D can be forced against the surface dthereby providing means to hold element D by friction to element D toprevent it from rocking too freely in use. A jaw nut (Z holds the rod Din its adjusted position.

The hinge element D is provided at one end with an even number ofindents (Z arranged at equi-distant intervals apart and this element maybe changed for one having a greater or less number of indents, so longas they are multiples of two and are spaced evenly apart. Thestick-holder E is provided with a tooth E which engages any one of theslots E that are formed in the lower end of the co-acting element Fhereinafter referred to as the crown-piece, and these slots are spacedapart at pro-determined points to sub-divide the periphery of thecrown-piece intermediate of the teeth f-fetc, there being preferably butfour of said teeth f so that they will mesh with any number of indents(Z formed in the element D, thereby making it unnecessary to have morethan one crown-piece to engage any equal number of indents.

The crown-piece is provided with a cone- Patented June 5, 1917.

ing the outer row of facets since the total length of the device withthe long-stick held in the stick-holder E is still short enough to reacha distance short of the wheel center when grinding, with the crown-piecein its lowest position, which is not the case with the apparatusheretofore used and therefore it has been customary to first hold thejewel and fasten it in a long-stick to out the inner facets, thusleading to inaccuracy in the cut ting and loss of time in cutting agiven number of stones. Figs. 6 and 7 show cones'haped pins and holes inthe cooperating parts while Figs. t and'5 show a different form but itis to be understood that any proper forms may be used that willcooperate to effect the purpose.

It will be seen that the crown-piece can be removed and replaced in avery short space of time and any tooth f can be used as the visiblegrinder and inserted opposite the de sired number on the periphery ofthe element D and thereafter successively rotated as the facets are cuton the jewel.

Inasmuch as the stick-holder is grasped and retained in the hand of theoperator during the entire grinding or polishing operation, it followsthat the operator adjusts the pressure on the stone to the particularrequirements of the stone, and in removing and replacing the crown-piecethe friction joints holds the hinge element or spacing device at aconvenient angle to receive the crown-piece, as will be readilyunderstood.

Having thus described our invention we claim as new,

1. The combination of a stick-holder having a crown-piece at one endprovided with an even number of projections spaced at equal distancesapart and provided with a central projection, and a spacing memberprovided with a greater number of indents of even number and spaced aneven distance tionary hinge element, a rod provided with a thread at oneend and a shoulder adjacent thereto which abuts one side of said1novable elements to hold it in frictional contact with said stationaryelement.

Signed at New York in the county of New York and State of New York this17th day of May A. D. 1916.

' FREDERioK E. HILLIARD. WALTER eouen STEVENS.

Witnesses:

J. HEYMEN, MERWIN F. ASHLEY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

